Automatic scaling for display of modulation domain measurements

Details Automatic scaling for display of modulation domain measurements Automatic scaling for display of modulation domain measurements

1991-09-16

1992-08-11

Snow, Walter E.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324115, 324121R, 324 77R, 395140, G01R 2316

Patent

active

051382520

ABSTRACT:
A method for examining an input signal and setting a modulation domain measuring instrument to a state which will produce a measurement and a stable, centered, properly scaled display of the signal, automatically. After finding the 50 percent voltage threshold of the input signal, an iterative process determines the minimum and maximum input frequency, then checks the ratio of these two frequencies against instruments limits, and adjusts the display values, if necessary to show only the higher frequencies. The method then varies the measurement parameters to seek the best frequency resolution while maintaining the measurement and display of frequency modulation. The display frequency scale is set to display the signal in the center half of the display, using values with no more than two significant digits for the center and span. The time scale is set to display a selected number of modulation cycles.

REFERENCES:
patent: 3204144 (1965-08-01), Deavenport
patent: 3581199 (1971-05-01), Spitz
patent: 4236151 (1980-11-01), Russ
patent: 4743844 (1988-05-01), Odenheimer
patent: 4764721 (1988-08-01), Slavin
patent: 4825449 (1989-04-01), McKissock
patent: 5072168 (1991-12-01), Ferguson

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